DANIEL ZWERDLING: The American Red Cross lists the worst natural disasters that might strike America. They worry about earthquakes in California, and tropical storms in Florida. But they say the biggest catastrophe could be a hurricane hitting New Orleans.WALTER MAESTRI: It's going to look like a massive shipwreck. There's going to be-- there's going to be, you know-- everything that that the water has carried in is going to be there. Alligators, moccasins, you know every kind of rodent that you could think of. All of your sewage treatment plants are under water. And of course the material is flowing free in the community. Disease becomes a distinct possibility now. The petrochemicals that are produced all up and down the Mississippi River --much of that has floated into this bowl. I mean this has become, you know, the biggest toxic waste dump in the world now. Is the city of New Orleans because of what has happened. DANIEL ZWERDLING: Do you think that the President of the United States and Congress understand that people like you and the scientists studying this think the city of New Orleans could very possibly disappear? WALTER MAESTRI: I think they know that, I think that they've been told that. I don't know that anybody, though, psychologically, you know has come to grips with that as-- as a-- a potential real situation. Just like none of us could possibly come to grips with the loss of the World Trade Center. And it's still hard for me to envision that it's gone. You know and it's impossible for someone like me to think that the French Quarter of New Orleans could be gone.Bush: "I don’t think anyone anticipated breach of the levees …Now we’re having to deal with it, and will."Factcheck.org has a nice rundown here.